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Question

If the point P(x,y) is equidistant from the points A(5,1) and B(-1,5), prove that 3x=2y.

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Solution

Let the point P(x,y) be equidistant from the points A(5,1) and B(-1,5). then,
PA=PB
PA2=PB2
(x5)2+(y1)2=(x+1)2+(y5)2
x2+y210x2y+26=x2+y2+2x10y+26
12x8y=0
12x=8y
3x=2y

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